README: Add announcement info
README: Add announcement info

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ocsigen/lwt,rneswold/lwt,rneswold/lwt,c-cube/lwt,rgrinberg/lwt,c-cube/lwt,rneswold/lwt,rgrinberg/lwt,rgrinberg/lwt,rgrinberg/lwt,ocsigen/lwt,ocsigen/lwt,c-cube/lwt